Electronic Principles
The peak value of a sine waveform is:

the maximum positive or negative value
the amplitude at 70.7% of the maximum value
None of these
the amplitude at 1.41 times the maximum value
the amplitude at 90% of the maximum value

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Electronic Principles
In a pure inductor:

ac current lags the voltage by 90 degree
ac current is converted to dc voltage
None of these
ac current and voltage are exactly in phase
ac current leads the voltage by 90 degree

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